SN4 ""

No	Pattern	Freq
1	[pron] is [not/n't] at [det]	102
2	[pers pn] is [not/n't] at [det]	96
3	it is [not/n't] at [det]	87
4	it is [not/n't] at [det]	87
5	[noun] is [not/n't] at [det]	52
6	[noun sg] is [not/n't] at [det]	35
7	[adj] is [not/n't] at [det]	22
8	[det] is [not/n't] at [det]	20
9	this is [not/n't] at [det]	12
10	this is [not/n't] at [det]	12
11	[noun prp] is [not/n't] at [det]	10
12	he is [not/n't] at [det]	8
13	he is [not/n't] at [det]	8
14	that is [not/n't] at [det]	7
15	that is [not/n't] at [det]	7
16	[noun pl] is [not/n't] at [det]	7
17	[verb] is [not/n't] at [det]	7
18	[Wh det] is [not/n't] at [det]	6
19	[conj] is [not/n't] at [det]	5
20	is [adv] [not/n't] at [det]	5
21	is [adv] [not/n't] at [det]	5
22	is [not/n't] [adj] at [det]	52
23	is [not/n't] [adj] at [det]	50
24	is [not/n't] [verb] at [det]	39
25	is [not/n't] [vb pp] at [det]	28
26	is [not/n't] [noun] at [det]	12
27	is [not/n't] [noun sg] at [det]	10
28	is [not/n't] [v-ing] at [det]	9
29	is [not/n't] [adv] at [det]	7
30	is [not/n't] [adv] at [det]	7